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Update tstart and tseg when using Lightcurve.truncate() #753

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merged 3 commits into from
Sep 6, 2023
Merged

Update tstart and tseg when using Lightcurve.truncate() #753

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a6ab26d
Update tstart and tseg when truncating the lc
matteobachetti Sep 1, 2023
7f9ac55
Add changelog
matteobachetti Sep 1, 2023
c3790bc
Setup tests to verify correct update of meancounts and many other att…
matteobachetti Sep 6, 2023
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1 change: 1 addition & 0 deletions docs/changes/753.bugfix.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Update tstart and tseg when using Lightcurve.truncate()
7 changes: 5 additions & 2 deletions stingray/lightcurve.py
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Expand Up @@ -1243,9 +1243,12 @@ def truncate(self, start=0, stop=None, method="index"):
raise ValueError("Unknown method type " + method + ".")

if method.lower() == "index":
return self._truncate_by_index(start, stop)
new_lc = self._truncate_by_index(start, stop)
else:
return self._truncate_by_time(start, stop)
new_lc = self._truncate_by_time(start, stop)
new_lc.tstart = new_lc.gti[0, 0]
new_lc.tseg = new_lc.gti[-1, 1] - new_lc.gti[0, 0]
return new_lc

def _truncate_by_index(self, start, stop):
"""Private method for truncation using index values."""
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9 changes: 9 additions & 0 deletions stingray/tests/test_lightcurve.py
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Expand Up @@ -814,6 +814,8 @@ def test_truncate_by_index(self):
assert np.allclose(lc1.frac_exp, np.array([1, 1, 1]))
np.testing.assert_almost_equal(lc1.gti[0][0], 1.5)
assert lc1.mjdref == lc.mjdref
assert lc1.tstart == 1.5
assert lc1.tseg == 3

lc2 = lc.truncate(stop=2)
assert np.allclose(lc2.time, np.array([1, 2]))
Expand All @@ -824,6 +826,9 @@ def test_truncate_by_index(self):
np.testing.assert_almost_equal(lc2.gti[-1][-1], 2.5)
assert lc2.mjdref == lc.mjdref

assert lc2.tstart == lc.tstart
assert lc2.tseg == 2

def test_truncate_by_time_stop_less_than_start(self):
lc = Lightcurve(self.times, self.counts)

Expand All @@ -843,12 +848,16 @@ def test_truncate_by_time(self):
assert np.allclose(lc1.counts, np.array([2, 2, 2, 2]))
np.testing.assert_almost_equal(lc1.gti[0][0], 0.5)
assert lc1.mjdref == lc.mjdref
assert lc1.tstart == 0.5
assert lc1.tseg == 4.0

lc2 = lc.truncate(stop=3, method="time")
assert np.allclose(lc2.time, np.array([1, 2]))
assert np.allclose(lc2.counts, np.array([2, 2]))
np.testing.assert_almost_equal(lc2.gti[-1][-1], 2.5)
assert lc2.mjdref == lc.mjdref
assert lc2.tstart == 0.5
assert lc2.tseg == 2

def test_split_with_two_segments(self):
test_time = np.array([1, 2, 3, 6, 7, 8])
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